1996 Pontia Sunfire GT

I am having a problem figuring out what else to do. My Sunfire is not firing on the #4 cylinder. We have checked the Ignition control module and tested the Ignition coil and the car shakes when it runs. The car runs like a tractor. We have also replace the crank shaft sensor and we replaced the fuel injector for the #4 cylinder and also did a tune up of new spark plugs and wires or the boots.
The car has 140,000 miles on it.
Can anyone tell what I can do to make this car run normal?
Thank you
DJones